Sewing-machine



a. h M NW 3 N 8 3 3 SHEETSSHEET l J. MARSDEN. SEWING MACHINE.v APPLICATION man FEB. 1. 192i.

Patented Oct. 18, 1921 J. MAR'SDEN.

SEWING MACHINE. APPLICATION FILED ran. 1. 1921 1,394,039,. Patented Oct. 18, 1921.

3 SHEETS-SHEET 2.

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J. MARSDEN.

SEWING MACHINE.

APPLICATION FILED FEB-1. 1921.

Patented 0011.18, 1921.

3 SHEETS-SHEET 3.

34' 19 E v 27265 Mania? UNITED STATES PATENT OFFICE.

JAMES MARSDEN, OF WIGAN, ENGLAND.

SEWING-MACHINE.

Application filed February '10 machines, and more especially to the type in which the needle thread is carried around or interlooped with the under thread by a shuttle having either an oscillating or a con tinuous rotary movement in a shuttle race,

5 the said under thread being contained in a case around which the loops of needle thread are carried by the shuttle.

The object of the invention is to provide an arrangement by which without altering, or materially altering, the construction of the machine, the spool or metallic reel for the under thread, can be made larger than heretofore, so as to accommodate a much greater supply of under thread, and thus 5 avoid having to rewind the metallic reel, or replace an empty bobbin by a full one into the shuttle, so frequently as has been customary. 'A large bobbin for the under thread is, of course desirable to avoid stopping the machines frequently to replace empty bobbins with full ones, anda characteristic feature of my invention is to enable a larger bobbin to be used for the under thread. The reels for the under thread in machines I am at present using in my factory, contain about 35 to yards of No. 40 cotton, but according to my present improvement, I so arrangethe shuttle, that it will contain five, ten or fifteen times as 40 much (or more) thread of similar gage, thus effecting a very considerable saving of labor because the reels will only require changing once or twice a day, against a dozen times a day,

My invention may be advantageously employed in machines in which the shuttles have continuous rotary movements, and in what are known as rotary shuttle machines also in machines in which the shuttles have reciprocating rotary movements and which are known as oscillating shuttle machines. My improvements, though applicable for both types of machines will be more par- Specification of Letters Patent.

Patented Oct. 18, 1921. 1, 1921. Serial No. 441,669.

' ticularly described in connection with the latter.

In existing machines, the shuttle rock shaft below the cloth plate (of the bed) upon which the material to be sewed rests, is journaled in such a position in proximity to the underside of the cloth plate or work plate, that there is no room to permit of a larger reel for the under thread to be used than that at present employed, and the problem to be solved therefore is, how to apply a larger reel for the under thread without in any way altering the position of the said shuttle rock shaft, or the bearings in which it is journaled.

My invention is characterized by the feature that the point about which the shuttle oscillates (or the point about which it rotates in rotary shuttle machines) is eccentric to the axis of the shaft which imparts to the said shuttle its motion, that is to say the point about which the shuttle oscillates (or rotates) is below the axis of the said driving shaft, and at a greater distance from the under side of the cloth plate or work plate than the shaft is. This enables the shuttle driver to have a longer radius than in existing machines, so that the shuttle itself and the reel for the under thread which is contained within a cavity in the shuttle, can be considerably larger than hitherto.

The invention will be understood from the following description reference being had to the accompanying drawings, in which Figure 1 is a partial sectional side elevation of an oscillating shuttle sewing machine embodying the present invention.

Fig. 2 is a partial front end view of the same with certain parts removed for clearness.

Fig. 3 is a partial front elevation of the same machine showing the shuttle in position to enter the loop of the needle thread.

Fig. 4 is a partial front elevation showing the shuttle in position to cast off the loop which has been carried around the bobbin case so that the lower thread has become engaged by the needle thread.

Figs. 5 to 18 represent views of parts of the machine, detached from the residue; Figs. 5 and 6 being a sectional elevation and face view of the crank arm at the end of the rock shaft; Figs. 7 and 8 a vertical section and face view of the boss which is fixed eccentrically in relation to the rock shaft; Figs. 9, 10 and 11 a vertical section of the shuttle driver a face View thereof and a .vertical section showing the rlght and left hand portion; Figs. 12, 13, and 14 a vertical section of the shuttle a face view thereof and a vertical section showing the reverse strong arm (not shown) to support the needle bar 3above the cloth plate or work plate 4, and a driving shaft extendingthrough the said arm to drive the needle bar. The needle bar 3 is arranged to slide upland down in the head 2 of'theneedle arm, and motion is transmitted to the needle bar from the driving shaft by suitable mechanism. The under thread which is interloopedwith the needle thread to form the stitch is carried by an oscillating shuttle 7 which is caused to-oscillate in a stationary shuttle-race S'by means of an oscillating shuttle driver 9 to which motion is imparted by the shuttle rock shaft 10 in the manner hereinafter described, such rock shaft being arranged below the cloth or work plate 4 of the machine. The shuttle consists as usualof three principal parts namely the circular body part having a cavity 7 fitted with a-central pivot 11 upon which the bobbin case 12 is mounted by means of its central tubular shank 13 and the beak 14. The bobbin 15 which is contained within the bobbin case 12 is made in theform of a spool, and is similar to ordinary spools except that it is of larger diameter, and the cavity 7 in the shuttle is adapted to receive this bobbin case 12 with the bobbin contained inside it, the bobbin case being held in place by means of a spring latch 16. The office of the beak 14 is to enter theloop of the needle thread presented by the needle and carry it around the bobbin case-so that the lower thread becomes engaged by the needle thread, after which the needle thread is drawn up by the vibrating arm of the take up.- The shuttle driver 9 has two horns 17, 18 oneof which bears against the butt of the shuttle 7 when driv- The circular shuttle race 8 is contained withinthe housing 19whic1 is-fixed stationary to the machine by set screws 19*, the said race forming a reinforcement or lining for the housing. This race is constructed with an internal peripheral groove 20 to receive and guide the rim of the shuttle, and with an external flange element 21 by which this race is secured in perative position in the housing 19 by screws 22 in threaded engagement with the housing. By unfastening the screws 22, the circular shuttle race should it 'become'worn, can be removed, and replaced of the said rock shaftlO, so that the major partof the said eccentric 23 shall lie below the shaft 10. Upon thisboss 23 which is turned true, I mount an annular strap 24 from which projects a radial arm 25having integral therewith the oscillatingshuttle driver 9. The said annular strap 24 which carries the driver 9 by-the radial arm 25, is bored true so that it can freely oscillate upon the boss23, and from one 'of these parts (preferably the connecting arm 25) projects a short studor pin 26 upon which is mounted an antifriction roller or sleeve. The said circular boss which as aforesaid is mounted eccentrically in relation totheaxis of the rock shaft 10 has a hole 27 in it to form a clearance for the end of the shaft 10 to-pass through, and the extreme end of the shaft 10 carries a crank arm 28 which projects a little beyond the saidboss 23. The crank arm has a tubular thickened portion 30' the pin or stud 26, so that'an oscillatingmovement is imparted to the oscillating shuttle driver 9 by the crank 28. The crank being fixed to the rock shaft 10 as aforesaid oscillates about theaxis of -the shaft lO and imparts its oscillation to the shuttle driver 9 which oscillates upon the axis of the eccentrica-lly-set boss or disk 23, which is fixed securely in position to the bed plate by screws 32 passed through holes in the boss 7 and the slot 31 in the crank 28 permits of the pin 26 having a free-play therein. It will accordingly be understood that theaxis upon' which the shuttledriver 9 oscillates is below the axis oftherock shaft 10 and at a greater distance from the under sideof the cloth plate4 than the rock'shaft 1O is,'and

this enables the oscillating shuttle driver 9 to have a longer radius than the radius of shuttle drivers in existing machines so that a larger shuttle and a larger bobbin and bobbin case contained within the cavity in the shuttle, can be used.

The shuttle driver consists of'the annular strap or sleeve 24 and the radial arm 25 with the pin 26, the said arm having the two horns 17 and 18, these horns being 10- cated in a plane which is clear of the strap 24. One of these horns bears against the butt of the shuttle, when driving it forward, and the other horn acts to drive the shuttle back.

Hitherto in oscillating shuttle machines the loops of the needle thread have frequently been carried around the bobbin case by a shuttle movement of only half a circle or even less, so that it was necessary to employ a cast over guide or some equivalent device'to direct the loops of the needle thread over or past the center of the bobbin case when they were carried forward by the shuttle, and this cast over movement imposed a considerable strain on the needle thread which detracted in a measure from the capacity of the machine to operate when fine gage or weak thread is used. According to my invention this disadvantage is entirely overcome by arranging the axis 34 of the rock shaft 10 and the axis 33 of the boss 23 in a plane passing through the middle of the vibrations of the crank arm 28 and the pin 26 of the shuttle driver or thereabouts. The position of boss 23 below the shuttle rock shaft 10 enables the pin 26 to be rocked through an arc of greater extent than that of the crank arm 28 so that the curves described thereby intersect each other. This will be understood by reference to Figs. .19 and 20 in which the are described by the pin 26 as represented by the dotted line 40, 41, 42 is of much greater angular extent, than the are described by the arm 28 appertaining to the rock shaft 10 as represented by the dotted line 40, 43, 42. The movement of the shuttle driver pin 26 and consequently the shuttle movement is therefore considerably more than half a circle, and the loops of the needle thread are carried over and past the center of the bobbin case, so that the loops slip off the beak 14 of the shuttle automatically and are drawn up by the take up without the use of a cast off guide at all. Fig. 3 shows the position of the beak 14 of the shuttle when about to enter the loop of the needle thread, and be driven forward by the shuttle driver, and Fig. 4 shows the position of the said beak 14 when it has carried the loop around the bobbin case and is ready to cast off its loop, whereupon the shuttle is driven backward so that its beak 14 comes again into the position shown in Fig. 3. hen the crank arm 28 is in the position shown in Fig. 19, the beak 14 of the shuttle is in the act of engaging the needle thread as shown in Fig. 3, and when the crank arm 23 is in the position shown in Fig. 20, the beak 14 of the shuttle is in the act of throwing off the thread as shown in Fig. 4.

The invention can be used as an attachment to be applied to existing machines, or it can be applied to new machines, its special duty being to enable the shuttle to carry a very much larger quantity of under thread so as to reduce the frequency with which the empty spools in shuttles have to be changed and substituted by filled ones.

I declare that what I claim is l. A sewing machine having in combination a shuttle driver so pivotally supported at the point upon which it oscillates or rotates, as to be eccentric to and below the axis of the operating shaft and thus be at a greater distance from the underside of the work plate, than the shaft is, in order to permit of it being of larger dimensions and enable a larger quantity of under thread to be contained within the shuttle, a circular shuttle race fixed concentrically with respect to the axis of the shuttle driver, a shuttle running on the said race, and a bobbin supported within the said shuttle.

2. In a sewing machine, the combination with an operating shaft, of a shuttle driver mounted upon an axis which is below the axis of the said shaft with the specific ob ject of giving more space to enable a larger shuttle and bobbin to be used than would otherwise be possible, adjacent arms on the said shaft and shuttle driver respectively, a pivot connecting the said arms so that the motion of the shaft is transmitted to the shuttle driver, a circular shuttle race sup ported concentric to the axis of the driver but eccentric to the axis of the operating shaft, and a shuttle and bobbin contained within the said race.

3. In a sewing machine, the combination with an operating shaft, of a circular boss fixed at or near the end of the machine and whose axis is eccentric to and below the axis of the shaft, an annular strap mounted freelyupon this boss so that it can be moved about the same, from which strap projects a radial arm carrying the shuttle driver, an arm fixed on the shaft adjacent to the said driver arm, and a pivot connecting the said arms so that the motion of the operating shaft is transmitted to the shuttle driver which moves upon the axis of the boss.

4. In a sewing machine, the combination withan operating rock shaft, of a shuttle driver mounted upon an axis which is below the shaft, adjacent arms on the said shaft and shuttle driver respectively and a pivot Connecting the said arms whereby an oscillating motion is transmitted to the shuttle driver from the rock shaft, but the said than the'oscillating shaft, by reason of the axis of the driver being eccentric tothat of the shaft.

5. In a sewing machine, the combination with an operating shaft of a fixed boss or disk whose axis is eccentric to and below the axis of the shaft, and a shuttle driver comprising an annular strap or sleeve, a radial arm projecting outwardly thereon, a pin on the arm, and horns located in a plane which is clear of the strap.

6. In a sewing machine, the combination of an operating shaft, of. a circular boss whose axis is eccentric to and below the axis of the operating shaft, said boss having a hole therein to produce a clearance aperture through which the end of the shaft passes; and a shuttle driver mounted on the boss.

7 In a sewing machine, the combination 7 with an operatingshaft of a shuttle and shuttle driver whose axis is eccentric to and below the axis of the shaft, a circular housing mounted concentrically with respect to the axis of the shuttle and driver, and a' circular shuttle race mounted within the housing for the shuttle to run in, the said race beingarranged to be readily removablefrom the housing so that it can be -replacedby a new one.

8.,In a sewing-machine, the combination of a work plate; a shuttle operating shaftlocated below and at a short distance therefrom; a relatively large shuttle, the axis whereof is eccentric to and below that of the shaft; a shuttle support; a shuttle driver; and means carried by the shaft for actuating the driver.

9. Ina sew'ingmachine, the combination Witnesses ROBERT IQXYV CRooK, HAROLD Lows.

JAMES MARSDEN.' 

